Actual source code: arpack.c

slepc-3.22.2 2024-12-02
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  1: /*
  2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
  4:    Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain

  6:    This file is part of SLEPc.
  7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
  8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  9: */
 10: /*
 11:    This file implements a wrapper to the ARPACK package
 12: */

 14: #include <slepc/private/epsimpl.h>
 15: #include "arpack.h"

 17: static PetscErrorCode EPSSetUp_ARPACK(EPS eps)
 18: {
 19:   PetscInt       ncv;
 20:   EPS_ARPACK     *ar = (EPS_ARPACK*)eps->data;

 22:   PetscFunctionBegin;
 23:   EPSCheckDefinite(eps);
 24:   EPSCheckNotStructured(eps);
 25:   if (eps->ncv!=PETSC_DETERMINE) {
 26:     PetscCheck(eps->ncv>=eps->nev+2,PetscObjectComm((PetscObject)eps),PETSC_ERR_ARG_OUTOFRANGE,"The value of ncv must be at least nev+2");
 27:   } else eps->ncv = PetscMin(PetscMax(20,2*eps->nev+1),eps->n); /* set default value of ncv */
 28:   if (eps->mpd!=PETSC_DETERMINE) PetscCall(PetscInfo(eps,"Warning: parameter mpd ignored\n"));
 29:   if (eps->max_it==PETSC_DETERMINE) eps->max_it = PetscMax(300,(PetscInt)(2*eps->n/eps->ncv));
 30:   if (!eps->which) PetscCall(EPSSetWhichEigenpairs_Default(eps));
 31:   PetscCheck(eps->which!=EPS_ALL,PetscObjectComm((PetscObject)eps),PETSC_ERR_SUP,"This solver does not support computing all eigenvalues");
 32:   PetscCheck(eps->which!=EPS_WHICH_USER,PetscObjectComm((PetscObject)eps),PETSC_ERR_SUP,"This solver does not support user-defined ordering of eigenvalues");
 33:   EPSCheckUnsupported(eps,EPS_FEATURE_BALANCE | EPS_FEATURE_ARBITRARY | EPS_FEATURE_REGION | EPS_FEATURE_CONVERGENCE | EPS_FEATURE_STOPPING | EPS_FEATURE_TWOSIDED);
 34:   EPSCheckIgnored(eps,EPS_FEATURE_EXTRACTION);

 36:   ncv = eps->ncv;
 37: #if defined(PETSC_USE_COMPLEX)
 38:   PetscCall(PetscFree(ar->rwork));
 39:   PetscCall(PetscMalloc1(ncv,&ar->rwork));
 40:   ar->lworkl = 3*ncv*ncv+5*ncv;
 41:   PetscCall(PetscFree(ar->workev));
 42:   PetscCall(PetscMalloc1(3*ncv,&ar->workev));
 43: #else
 44:   if (eps->ishermitian) {
 45:     ar->lworkl = ncv*(ncv+8);
 46:   } else {
 47:     ar->lworkl = 3*ncv*ncv+6*ncv;
 48:     PetscCall(PetscFree(ar->workev));
 49:     PetscCall(PetscMalloc1(3*ncv,&ar->workev));
 50:   }
 51: #endif
 52:   PetscCall(PetscFree(ar->workl));
 53:   PetscCall(PetscMalloc1(ar->lworkl,&ar->workl));
 54:   PetscCall(PetscFree(ar->select));
 55:   PetscCall(PetscMalloc1(ncv,&ar->select));
 56:   PetscCall(PetscFree(ar->workd));
 57:   PetscCall(PetscMalloc1(3*eps->nloc,&ar->workd));

 59:   PetscCall(EPSAllocateSolution(eps,0));
 60:   PetscCall(EPS_SetInnerProduct(eps));
 61:   PetscCall(EPSSetWorkVecs(eps,2));
 62:   PetscFunctionReturn(PETSC_SUCCESS);
 63: }

 65: static PetscErrorCode EPSSolve_ARPACK(EPS eps)
 66: {
 67:   EPS_ARPACK     *ar = (EPS_ARPACK*)eps->data;
 68:   char           bmat[1],howmny[] = "A";
 69:   const char     *which;
 70:   PetscInt       n,ld,iparam[11],ipntr[14],ido,info,nev,ncv,rvec;
 71: #if !defined(PETSC_HAVE_MPIUNI) && !defined(PETSC_HAVE_MSMPI)
 72:   MPI_Fint       fcomm;
 73: #endif
 74:   PetscScalar    sigmar,*pV,*resid;
 75:   Vec            x,y,w = eps->work[0];
 76:   Mat            A;
 77:   PetscBool      isSinv,isShift;
 78: #if !defined(PETSC_USE_COMPLEX)
 79:   PetscScalar    sigmai = 0.0;
 80: #endif

 82:   PetscFunctionBegin;
 83:   nev = eps->nev;
 84:   ncv = eps->ncv;
 85: #if !defined(PETSC_HAVE_MPIUNI) && !defined(PETSC_HAVE_MSMPI)
 86:   fcomm = MPI_Comm_c2f(PetscObjectComm((PetscObject)eps));
 87: #endif
 88:   n = eps->nloc;
 89:   PetscCall(EPSGetStartVector(eps,0,NULL));
 90:   PetscCall(BVSetActiveColumns(eps->V,0,0));  /* just for deflation space */
 91:   PetscCall(BVCopyVec(eps->V,0,eps->work[1]));
 92:   PetscCall(BVGetLeadingDimension(eps->V,&ld));
 93:   PetscCall(BVGetArray(eps->V,&pV));
 94:   PetscCall(VecGetArray(eps->work[1],&resid));

 96:   ido  = 0;            /* first call to reverse communication interface */
 97:   info = 1;            /* indicates an initial vector is provided */
 98:   iparam[0] = 1;       /* use exact shifts */
 99:   iparam[2] = eps->max_it;  /* max Arnoldi iterations */
100:   iparam[3] = 1;       /* blocksize */
101:   iparam[4] = 0;       /* number of converged Ritz values */

103:   /*
104:      Computational modes ([]=not supported):
105:             symmetric    non-symmetric    complex
106:         1     1  'I'        1  'I'         1  'I'
107:         2     3  'I'        3  'I'         3  'I'
108:         3     2  'G'        2  'G'         2  'G'
109:         4     3  'G'        3  'G'         3  'G'
110:         5   [ 4  'G' ]    [ 3  'G' ]
111:         6   [ 5  'G' ]    [ 4  'G' ]
112:    */
113:   PetscCall(PetscObjectTypeCompare((PetscObject)eps->st,STSINVERT,&isSinv));
114:   PetscCall(PetscObjectTypeCompare((PetscObject)eps->st,STSHIFT,&isShift));
115:   PetscCall(STGetShift(eps->st,&sigmar));
116:   PetscCall(STGetMatrix(eps->st,0,&A));
117:   PetscCall(MatCreateVecsEmpty(A,&x,&y));

119:   if (isSinv) {
120:     /* shift-and-invert mode */
121:     iparam[6] = 3;
122:     if (eps->ispositive) bmat[0] = 'G';
123:     else bmat[0] = 'I';
124:   } else if (isShift && eps->ispositive) {
125:     /* generalized shift mode with B positive definite */
126:     iparam[6] = 2;
127:     bmat[0] = 'G';
128:   } else {
129:     /* regular mode */
130:     PetscCheck(!eps->ishermitian || !eps->isgeneralized,PetscObjectComm((PetscObject)eps),PETSC_ERR_SUP,"Spectral transformation not supported by ARPACK hermitian solver");
131:     iparam[6] = 1;
132:     bmat[0] = 'I';
133:   }

135: #if !defined(PETSC_USE_COMPLEX)
136:   if (eps->ishermitian) {
137:     switch (eps->which) {
138:       case EPS_TARGET_MAGNITUDE:
139:       case EPS_LARGEST_MAGNITUDE:  which = "LM"; break;
140:       case EPS_SMALLEST_MAGNITUDE: which = "SM"; break;
141:       case EPS_TARGET_REAL:
142:       case EPS_LARGEST_REAL:       which = "LA"; break;
143:       case EPS_SMALLEST_REAL:      which = "SA"; break;
144:       default: SETERRQ(PetscObjectComm((PetscObject)eps),PETSC_ERR_ARG_WRONG,"Wrong value of eps->which");
145:     }
146:   } else {
147: #endif
148:     switch (eps->which) {
149:       case EPS_TARGET_MAGNITUDE:
150:       case EPS_LARGEST_MAGNITUDE:  which = "LM"; break;
151:       case EPS_SMALLEST_MAGNITUDE: which = "SM"; break;
152:       case EPS_TARGET_REAL:
153:       case EPS_LARGEST_REAL:       which = "LR"; break;
154:       case EPS_SMALLEST_REAL:      which = "SR"; break;
155:       case EPS_TARGET_IMAGINARY:
156:       case EPS_LARGEST_IMAGINARY:  which = "LI"; break;
157:       case EPS_SMALLEST_IMAGINARY: which = "SI"; break;
158:       default: SETERRQ(PetscObjectComm((PetscObject)eps),PETSC_ERR_ARG_WRONG,"Wrong value of eps->which");
159:     }
160: #if !defined(PETSC_USE_COMPLEX)
161:   }
162: #endif

164:   do {

166: #if !defined(PETSC_USE_COMPLEX)
167:     if (eps->ishermitian) {
168:       PetscStackCallExternalVoid("ARPACKsaupd",ARPACKsaupd_(&fcomm,&ido,bmat,&n,which,&nev,&eps->tol,resid,&ncv,pV,&ld,iparam,ipntr,ar->workd,ar->workl,&ar->lworkl,&info));
169:     } else {
170:       PetscStackCallExternalVoid("ARPACKnaupd",ARPACKnaupd_(&fcomm,&ido,bmat,&n,which,&nev,&eps->tol,resid,&ncv,pV,&ld,iparam,ipntr,ar->workd,ar->workl,&ar->lworkl,&info));
171:     }
172: #else
173:     PetscStackCallExternalVoid("ARPACKnaupd",ARPACKnaupd_(&fcomm,&ido,bmat,&n,which,&nev,&eps->tol,resid,&ncv,pV,&ld,iparam,ipntr,ar->workd,ar->workl,&ar->lworkl,ar->rwork,&info));
174: #endif

176:     if (ido == -1 || ido == 1 || ido == 2) {
177:       if (ido == 1 && iparam[6] == 3 && bmat[0] == 'G') PetscCall(VecPlaceArray(x,&ar->workd[ipntr[2]-1])); /* special case for shift-and-invert with B semi-positive definite*/
178:       else PetscCall(VecPlaceArray(x,&ar->workd[ipntr[0]-1]));
179:       PetscCall(VecPlaceArray(y,&ar->workd[ipntr[1]-1]));

181:       if (ido == -1) {
182:         /* Y = OP * X for the initialization phase to
183:            force the starting vector into the range of OP */
184:         PetscCall(STApply(eps->st,x,y));
185:       } else if (ido == 2) {
186:         /* Y = B * X */
187:         PetscCall(BVApplyMatrix(eps->V,x,y));
188:       } else { /* ido == 1 */
189:         if (iparam[6] == 3 && bmat[0] == 'G') {
190:           /* Y = OP * X for shift-and-invert with B semi-positive definite */
191:           PetscCall(STMatSolve(eps->st,x,y));
192:         } else if (iparam[6] == 2) {
193:           /* X=A*X Y=B^-1*X for shift with B positive definite */
194:           PetscCall(MatMult(A,x,y));
195:           if (sigmar != 0.0) {
196:             PetscCall(BVApplyMatrix(eps->V,x,w));
197:             PetscCall(VecAXPY(y,sigmar,w));
198:           }
199:           PetscCall(VecCopy(y,x));
200:           PetscCall(STMatSolve(eps->st,x,y));
201:         } else {
202:           /* Y = OP * X */
203:           PetscCall(STApply(eps->st,x,y));
204:         }
205:         PetscCall(BVOrthogonalizeVec(eps->V,y,NULL,NULL,NULL));
206:       }

208:       PetscCall(VecResetArray(x));
209:       PetscCall(VecResetArray(y));
210:     } else PetscCheck(ido==99,PetscObjectComm((PetscObject)eps),PETSC_ERR_LIB,"Internal error in ARPACK reverse communication interface (ido=%" PetscInt_FMT ")",ido);

212:   } while (ido != 99);

214:   eps->nconv = iparam[4];
215:   eps->its = iparam[2];

217:   PetscCheck(info!=3,PetscObjectComm((PetscObject)eps),PETSC_ERR_LIB,"No shift could be applied in xxAUPD. Try increasing the size of NCV relative to NEV");
218:   PetscCheck(info==0 || info==1,PetscObjectComm((PetscObject)eps),PETSC_ERR_LIB,"Error reported by ARPACK subroutine xxAUPD (%" PetscInt_FMT ")",info);

220:   rvec = PETSC_TRUE;

222:   if (eps->nconv > 0) {
223: #if !defined(PETSC_USE_COMPLEX)
224:     if (eps->ishermitian) {
225:       PetscStackCallExternalVoid("ARPACKseupd",ARPACKseupd_(&fcomm,&rvec,howmny,ar->select,eps->eigr,pV,&ld,&sigmar,bmat,&n,which,&nev,&eps->tol,resid,&ncv,pV,&ld,iparam,ipntr,ar->workd,ar->workl,&ar->lworkl,&info));
226:     } else {
227:       PetscStackCallExternalVoid("ARPACKneupd",ARPACKneupd_(&fcomm,&rvec,howmny,ar->select,eps->eigr,eps->eigi,pV,&ld,&sigmar,&sigmai,ar->workev,bmat,&n,which,&nev,&eps->tol,resid,&ncv,pV,&ld,iparam,ipntr,ar->workd,ar->workl,&ar->lworkl,&info));
228:     }
229: #else
230:     PetscStackCallExternalVoid("ARPACKneupd",ARPACKneupd_(&fcomm,&rvec,howmny,ar->select,eps->eigr,pV,&ld,&sigmar,ar->workev,bmat,&n,which,&nev,&eps->tol,resid,&ncv,pV,&ld,iparam,ipntr,ar->workd,ar->workl,&ar->lworkl,ar->rwork,&info));
231: #endif
232:     PetscCheck(info==0,PetscObjectComm((PetscObject)eps),PETSC_ERR_LIB,"Error reported by ARPACK subroutine xxEUPD (%" PetscInt_FMT ")",info);
233:   }

235:   PetscCall(BVRestoreArray(eps->V,&pV));
236:   PetscCall(VecRestoreArray(eps->work[1],&resid));
237:   if (eps->nconv >= eps->nev) eps->reason = EPS_CONVERGED_TOL;
238:   else eps->reason = EPS_DIVERGED_ITS;

240:   PetscCall(VecDestroy(&x));
241:   PetscCall(VecDestroy(&y));
242:   PetscFunctionReturn(PETSC_SUCCESS);
243: }

245: static PetscErrorCode EPSBackTransform_ARPACK(EPS eps)
246: {
247:   PetscBool      isSinv;

249:   PetscFunctionBegin;
250:   PetscCall(PetscObjectTypeCompare((PetscObject)eps->st,STSINVERT,&isSinv));
251:   if (!isSinv) PetscCall(EPSBackTransform_Default(eps));
252:   PetscFunctionReturn(PETSC_SUCCESS);
253: }

255: static PetscErrorCode EPSReset_ARPACK(EPS eps)
256: {
257:   EPS_ARPACK     *ar = (EPS_ARPACK*)eps->data;

259:   PetscFunctionBegin;
260:   PetscCall(PetscFree(ar->workev));
261:   PetscCall(PetscFree(ar->workl));
262:   PetscCall(PetscFree(ar->select));
263:   PetscCall(PetscFree(ar->workd));
264: #if defined(PETSC_USE_COMPLEX)
265:   PetscCall(PetscFree(ar->rwork));
266: #endif
267:   PetscFunctionReturn(PETSC_SUCCESS);
268: }

270: static PetscErrorCode EPSDestroy_ARPACK(EPS eps)
271: {
272:   PetscFunctionBegin;
273:   PetscCall(PetscFree(eps->data));
274:   PetscFunctionReturn(PETSC_SUCCESS);
275: }

277: SLEPC_EXTERN PetscErrorCode EPSCreate_ARPACK(EPS eps)
278: {
279:   EPS_ARPACK     *ctx;

281:   PetscFunctionBegin;
282:   PetscCall(PetscNew(&ctx));
283:   eps->data = (void*)ctx;

285:   eps->ops->solve          = EPSSolve_ARPACK;
286:   eps->ops->setup          = EPSSetUp_ARPACK;
287:   eps->ops->setupsort      = EPSSetUpSort_Basic;
288:   eps->ops->destroy        = EPSDestroy_ARPACK;
289:   eps->ops->reset          = EPSReset_ARPACK;
290:   eps->ops->backtransform  = EPSBackTransform_ARPACK;
291:   PetscFunctionReturn(PETSC_SUCCESS);
292: }